Need 3/8" tubing? Check at your friendly local refrigeration supply house - even in Alaska people need AC and refrigeration systems...
They use 3/8 and all the other odd "in-between" sizes in their lines, in both hard and soft copper tube - the refrigerant has to move through the lines at the right velocity to move the oil back to the compressor, so they need a broad size selection.
If they don't have any 'damaged' lengths, they might know a local contractor who has ordered that size recently, and can fish some cut-off pieces out of his Copper Scrap pile.
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